December weather forecastJuana Díaz, PR
December
Weather in December
December rounds off the year in Puerto Rico, USA, with a noticeable coolness in the air. Despite the slight dip in temperatures, the month remains highly pleasant, making it an ideal time for exploring the city. December marks this slight drop in sea temperatures after a remarkably warm and moist November. Both rainfall and sunshine hours see a reduction compared to the previous month, delivering a calming close to the year. As December gives way to January, one can eagerly anticipate more sunlight hours and a slightly warmer climate.Temperature
During December, the average high-temperature is a still moderately hot 82°F (27.8°C), maintaining a close resemblance to that of the preceding month. An average low-temperature of 72.7°F (22.6°C) is observed during December nights.Heat index
The heat index in December is computed to be a hot 87.8°F (31°C). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Humidity
In Juana Díaz, the average relative humidity in December is 79%.Rainfall
In Juana Díaz, Puerto Rico, in December, during 18.6 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. Throughout the year, there are 249.1 rainfall days, and 28.82" (732mm) of precipitation is accumulated.Ocean temperature
In Juana Díaz, in December, the average water temperature is 82°F (27.8°C).Note: For engaging in any water activities, temperatures from 77°F (25°C) to 84.2°F (29°C) are viewed as outstanding and exceptionally pleasing for prolonged durations.
Daylight
The month with the shortest days is December, with an average of 11h and 6min of daylight.On the first day of the month, sunrise is at 6:41 am and sunset at 5:49 pm. On the last day of December, sunrise is at 6:57 am and sunset at 6:01 pm AST.
Sunshine
In Juana Díaz, the average sunshine in December is 7h.UV index
January through April, November and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average maximum UV index of 6 in December leads to these recommendations:
Ward off overexposure. Defence against solar harm is crucial. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Warning! The Sun's UV rays intensify with reflections from sand and water.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Juana Díaz, PR
- Average high temperature in December: 82°F
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is January (81°F).
- Average low temperature in December: 72.7°F
The month with the highest average low temperature is August (76.6°F).
The coldest months (with the lowest average low temperature) are February and March (70.9°F).
Average pressure in December
Juana Díaz, PR
- Average pressure in December: 29.98"Hg
The months with the highest atmospheric pressure are January and February (30.01"Hg).
The months with the lowest atmospheric pressure are October and November (29.9"Hg).
Average wind speed in December
Juana Díaz, PR
- Average wind speed in December: 6.6mph
The windiest month (with the highest average wind speed) is July (8mph).
The calmest month (with the lowest average wind speed) is November (5.5mph).
Average humidity in December
Juana Díaz, PR
- Average humidity in December: 79%
The month with the highest relative humidity is November (81%).
The month with the lowest relative humidity is March (76%).
Average rainfall in December
Juana Díaz, PR
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is September (4.45").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in December
Juana Díaz, PR
- Average rainfall days in December: 18.6 days
The month with the highest number of rainy days is October (24.8 days).
The month with the least rainy days is February (15 days).
Average sea temperature in December
Juana Díaz, PR
- Average sea temperature in December: 81.9°F
The best month for swimming (with the highest average sea temperature) is September (85.3°F).
The coldest month (with the lowest average sea temperature) is March (79.3°F).
Average daylight in December /
Average sunshine in December
Juana Díaz, PR
- Average daylight in December: 11h and 6min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in December: 7h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 54min).
Average sunshine days in December
Juana Díaz, PR
- Average sunshine days in December: 7 days
The month with the most sunshine days is March (7.6 days).
The month with the least sunshine days is October (2.6 days).
Average UV index in December
Juana Díaz, PR
- Average UV index in December: 6
The months with the highest UV index are May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, November and December (UV index 6).
Average cloud cover in December
Juana Díaz, PR
- Average cloud cover in December: 28
The month with the most cloud cover is May (Cloud cover 34).
The month with the least cloud cover is February (Cloud cover 25).
Average visibility in December
Juana Díaz, PR
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
